• Country
• Germany

• Manufacturer / Brand
• Beyer; Berlin, später Beyerdynamic; Heilbronn

• Year
• 1976

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 309155

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 4

• Semiconductors
• BF245B BF245B BC239 BC239 S041 S041 LM386 LM386 BPW34 BPW34 1N4148

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / DKO 90: 6 x 1,2 Volt

• Loudspeaker
• - Is a Headphone or Earphone

• Material
• Various materials

• from Radiomuseum.org
• Model: Infrarot-Kopfhörer Infraphone DT 444 - Beyer; Berlin, später

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 155 x 210 x 110 mm / 6.1 x 8.3 x 4.3 inch

• Notes

• Maße bei max. ausgezogener Höhe gemessen.

  Infrarot-Diode in Hörer rechts. Ladebuchse in Spezialausführung in Hörer links. Lautstärke-Ein/Aus am Hörer links.

  Pro Hörer-Platine je 3 Akku-Zellen DKO 90

• Mentioned in
• - - Manufacturers Literature (Katalog Beyer Dynamic 1976)

• Literature/Schematics (1)
• Funkschau (24/1976, S. 1061 / HiFi 76 in Düsseldorf)

• Author
• Model page created by Hans-Werner Ellerbrock. See "Data change" for further contributors.

• Other Models

• Here you find 149 models, 140 with images and 55 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Beyer; Berlin, später Beyerdynamic; Heilbronn